This is the recipe together with the video so its all very well explained.
FOR THE EGGLESS VANILLA SPONGE
1 yogurt used as a measurement (about 150 grams)
1 3/4th measurement of sugar
3 measurements of white flour
2/4 measurement of oil
1 measurement of whole milk
1 envelope (2.5 teaspoons) of baking powder
3/4 teaspoon of soda bicarbonate
1 heaped tablespoon of vanilla essence
FOR THE CHOCOLATE SAUCE
1/2 cup milk
200 grams of milk chocolate